HTC Desire :: WiFi Constantly Cycles On And Off

I've got an unbranded Desire running 2.2. Occasionally (maybe twice a week) it will go into a cycle where WiFi disables itself when connected. Once fully disabled, it enables itself again. Once it has found my home network, it obtains the IP address. At the point of connection it then disables wifi and starts the process again. Normally, it works fine. Connected, stable, just as you'd expect. Once it starts on this loop I restart the phone and it works absolutely fine. This has happened on another WiFi network other than the home network. I've got the power control widget, and since this started I've now got WiFi manager installed as well. I run locale with a scenario that turns WiFi on when I'm at home using the location power saving add-on, however this WiFi problem has occured with both locale enabled and disabled.